C＋＋ ：多重继承的地址问题

class A{public:        virtual void functional(){};};class B{public:    virtual void functional(){};};class C  : public A , public B{public:};int main(int argc, const char * argv[]) {    // insert code here...        C object;    A* pa = &object;    B* pb = &object;    C* pc = &object;        cout << "pa " <<long(pa) <<endl;        cout << "pb " <<long(pb) <<endl;        cout << "pc " <<long(pc) <<endl;